Scenario: I recently purchased 5 systems with Windows 7 pre-loaded and up-gradable to Windows 10. Since my Internet was slow, the up-gradation on one PC took nearly 5 to 6 hrs and you know it’s not going to be easy to do the same on rest of the PCs. So I decided to…
Checksums are hashes used to confirm both the file integrity and authenticity. A Hash is not ‘encryption’. It is (sometimes called digest) a kind of ‘signature’ for a text or a data file. SHA-1 generates 160 bits, SHA256 generates 256-bit (32 byte), whereas SHA512 generates 512 bits signature for a…
We saw from our previous article How to install Hashcat. Also we saw the use of Hashcat with pre-bundled examples. Now, Lets crack the passwords on your Linux machines, A real world example! Create a User on Linux Firstly on a terminal window, create a user and set a password…
From our earlier posts, you would have seen How to upgrade to php-5.5 using remi repository. Today we shall see How to Upgrade PHP to it’s latest version 7.0 from 5.5 through the same Remi repository using YUM. RPM of the latest version of PHP are available in remi-php70 repo. WARNING:…
Hashcat is an advanced CPU-based password recovery utility available for Windows, Mac and Linux. It provides 7 unique modes of attack (like Brute-force, Dictionary, Permutation, Prince, Table-Lookup, Combination etc., ) for over 100 optimized hashing algorithms (like md5, sha256, sha512 etc.,). Hashcat is considered to be world’s fastest CPU-based password…
Question: By default CentOS 6 comes with a Python version 2.4. For SQLMAP application I need to upgrade Python to version 2.6 and above. Even though I tried to upgrade it using yum, it still upgraded to a minor version of 2.4 and not 2.6 or later. Please help me how to…
All of you would have used commands useradd and passwd very commonly or at least in the recent evolution, you would have used GUI to create user accounts on a unix based systems. But being a Linux System Administrator, you should have in-depth knowledge on things rather than just depending…
In this tutorial we shall see how to install Shellinabox (Pronounced as “Shell In A Box”) for remote access to Linux SSH terminal using AJAX/JavaScript and CSS enabled web browsers. Assuming that your Linux server is enabled with Firewall and allows only necessary ports (says HTTP(s)), then Shellinabox is an ideal…
virt-viewer is a minimal tool for displaying the graphical console of a virtual machine. You can install virt-viewer using yum installer as shown below: # yum install virt-viewer Setting up Install Process Resolving Dependencies –> Running transaction check —> Package virt-viewer.x86_64 0:0.0.2-3.el5 set to be updated :::::::::: Installed: virt-viewer.x86_64 0:0.0.2-3.el5…
If you ever want to export a display from Linux machine to Windows, then the obvious tool to rely upon is Xmanager. I have been using it for quite sometime, but recently when I opened the Xmanager, it prompted me the below error. Failed to get the installation date from the system registry!…
In our previous article, you would have seen How to Install Xen Virtualization Software on Linux and Launch a VM using virt-manager? Today, we shall see how to clone a VM on Xen HyperVisor using virt-clone. Step 1: Firstly, we need to find virt-clone utility is available using the below…
Question: RSAkeyfind a software written by Nadia Heninger and J Alex Halderman to find out the Cached RSA keys from memory dumps. I recently referred your tutorial to create a memory dump on my Ubuntu server. Once I had the dump ready, I decided to find RSA key using RSAkeyfind software. But…
Ncdu is a disk usage analyzer based on ncurses. It provides a disk usage summary in a TUI (Text user interface) and finding large files and folders is really simple. ncdu is a curses-based version of the well-known “du” command in Linux, and provides a fast way to see what directories…
Question: Recently, I was installing Linux Memory Extractor (LiME) to acquire memory dump on CentOS virtual machine, including the Volatile memory. Once I have the dump, it can be analyzed using Volatility software to investigate volatile memory for a forensic operation. Unfortunately, the installation failed with an error message as ‘Importerror:…
Pip is a package management system used to install and manage software packages written in Python. Many packages can be found in the Python Package Index (PyPI). Python 2.7.9 and later (on the python2 series), and Python 3.4 and later include pip (pip3 for Python 3) by default, so you…
Question: I had created a two-node architecture based on Openstack cloud reading your previous article. It was of great help. Now I could able to boot the VM’s. I selected the m1.medium flavor and booted the CentOS virtual image. Upon logging to the guest OS, using df -h command found only…
Question: I was installing Linux Memory Extractor (LiME) to acquire memory from my CentOS virtual machine. LiME (formerly DMD) is a program that allows acquisition of volatile memory from Linux based machines, including Android operating system. LiME uses Loadable Kernel Module (LKM) that provides full memory acquisition that are useful…
Question: Recently I had to copy huge number of files occupying storage space of 7TB to another location on my CentOS box. I used ‘cp’ command, but for some reason (may be a network issue), the command exited after copying few files and directories. Now if I resume the copy operation,…
Recently I had to upgrade Sendmail version 8.13 to the latest version 8.15 on CentOS 5. If you are someone planning to upgrade Sendmail on your Linux machine, then here’s how you can do that. To start with, you need to download the latest version (8.15, at the time of writing…